Principal Investigator:MacDonald, Glen MLicenced Year(s):
2005
Summary:
The researchers believe that the treeline zone is one of the most sensitive areas on earth to temperature changes, both natural and caused by global warming. They would like to take a small core (5 cm diameter) from the mud at the bottom of two small lakes close to Back Lake, northeast of Yellowknife. In the laboratory, they will analyze the cores for temperature-sensitive aquatic insect remains...

Principal Investigator:MacDonald, Glen MLicenced Year(s):
1993
Summary:
As part of an on-going study, this research will involve collecting cores from trees located in the Campbell-Dolomite Uplands (near Campbell Lake). This data will be added to data collected in other locations (past studies) in order to determine how past climate has influenced the growth of trees (as indicated by tree rings within the tree trunk). The research is helpful in trying to understand ...

Principal Investigator:MacDonald, Glen MLicenced Year(s):
1992
1990Summary:
The research party will continue to study past climatic variation and will continue to examine the relationship between climatic change and vegetation response. They will continue lake sediment coring and will collect tree increment cores....

Principal Investigator:MacDonald, Glen MLicenced Year(s):
1989
1988Summary:
Dr. Glen MacDonald and his team will be obtaining lake sediment cores, samples of pine needles, cones, seeds and tree-ring cores from 2 sites near Hay River. Fossil pollen from the sediment will be used to document the chronology of pine migration into the NWT following the last ice-age. The study will be used to understand postglacial history of northern plants....

Principal Investigator:MacDonald, Glen MLicenced Year(s):
1988
Summary:
to obtain lake sediment cores, peat samples, and tree-ring cores in the Kazan river region to examine the postglacial history of the northern treeline in this region...

Principal Investigator:MacDonald, Glen MLicenced Year(s):
1987
Summary:
To use fossil pollen and plant macrofossils from small lakes to reconstruct the response of plant populations in the treeline zone to climatic change. Modern pollen surface samples from small lakes in the treeline zone will be collected to aoid in the interpretation of the fossil pollen samples. The study area will include the boreal forest, forest-tundra and tundra zones near Yellowknife (115 W...

Principal Investigator:MacDonald, Glen MLicenced Year(s):
1985
Summary:
To collect surface samples from small lakes to reconstruct the response of plant populations in the treeline zone to climatic change....